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§5164. Storage of Hazardous Substances.

(a) Substances which, when mixed, react violently, or evolve toxic vapors or
gases, or which in combination become hazardous by reason of toxicity, oxidizing
power, flammability, explosibility, or other properties, shall be evaluated
for compatibility before storing. Incompatible substances shall be separated
from each other in storage by distance, or by partitions, dikes, berms, secondary
containment or otherwise, so as to preclude accidental contact between them.

(b) Hazardous substances shall be stored in containers, such as those approved
by the U.S. Department of Transportation (DOT), which are chemically inert to
and appropriate for the type and quantity of the hazardous substance.

(c) Containers of hazardous substances shall not be stored in such locations
or manner as to result in physical damage to, or deterioration of, the container.
Containers shall not be stored where they are exposed to heat sufficient to
rupture the containers or to cause leakage.

(d) Containers used to package a substance which gives off toxic, poisonous,
corrosive, asphyxiant, suffocant, or anesthetic fumes, gases, or vapors in hazardous
amounts (e.g., fuming sulfuric acid, hydrofluoric acid, nitrous oxide, chlorine,
or other compressed or liquefied toxic gases) shall not be stored locations
where it could be reasonably anticipated that employees would be exposed. This
requirement shall not apply to small quantities of such materials kept in closed
containers, or to tank cars or trucks.